| LL Com: A Near-contact Total Eclipsing Binary at a Key Stage of Evolution | |
Hu, Ke1; Chen, Kun1; Xiang, Fu-Yuan1; Yu, Yun-Xia1; Zhao EG(赵二刚)2
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| 发表期刊 | ASTRONOMICAL JOURNAL
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| 2019-09-01 | |
| 卷号 | 158期号:3页码:9 |
| DOI | 10.3847/1538-3881/ab322c |
| 产权排序 | 第2完成单位 |
| 收录类别 | SCI |
| 关键词 | binaries: close binaries: eclipsing stars: evolution stars: individual (LL Com) |
| 摘要 | Despite the discovery of LL Com, a Lyrae-type eclipsing binary system, approximately 60 yr ago, little has been found concerning its detailed photometry and orbital-period change until now. In this paper, we present the first multi-band charge-coupled-device photometric light curves, from which a significant luminosity reduction around the primary eclipse is revealed. Based on LAMOST data, we first determined LL Com's spectrum as F1V and then analyzed the light curves with the 2015 version of the Wilson-Devinney code. The fact that LL Com is a nearcontact binary system with a semi-detached configuration, where the secondary component only fills its Roche lobe and the primary component fills more than 95% of its Roche lobe, is suggested through the photometric solution. In addition, according to archival photometry and previously published times of minima, a secular period increase at a rate of (P) over dot = 2.62 x 10(-7) day yr(-1) was found, which implies a continuous mass transfer from the secondary to the primary. Utilizing the photometric solution and the simulations of single-particle trajectories, we propose the existence of a cool spot on the surface of the primary component. This cool spot can be naturally produced by the impacts that occur during mass flow, and it also successfully interprets the luminosity reduction in the light curves. Finally, with the combination of thermal relaxation oscillation theory and the Roche-Lobe model, we conclude that LL Com is transitioning from the semi-detached to the detached phase. |
| 资助项目 | National Natural Science Foundation of China[U1731110] ; National Natural Science Foundation of China[U1731106] ; National Natural Science Foundation of China[11703020] ; Chinese Academy of Sciences[U1731110] ; Chinese Academy of Sciences[U1731106] |
| 项目资助者 | National Natural Science Foundation of China[U1731110, U1731106, 11703020] ; Chinese Academy of Sciences[U1731110, U1731106] |
| 语种 | 英语 |
| 学科领域 | 天文学 ; 恒星与银河系 ; 恒星形成与演化 |
| 文章类型 | Article |
| 出版者 | IOP PUBLISHING LTD |
| 出版地 | TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND |
| ISSN | 0004-6256 |
| URL | 查看原文 |
| WOS记录号 | WOS:000481535300001 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | HOT-SPOT ; SYSTEM ; LIGHT ; ANDROMEDAE ; LOCATION ; STARS |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/20860 |
| 专题 | 双星与变星研究组 |
| 通讯作者 | Xiang, Fu-Yuan |
| 作者单位 | 1.Physics Department, University of Xiangtan, 411105 Xiangtan, Hunan Province, People's Republic of China 2.Yunnan Observatories, Chinese Academy of Sciences, 650216 Kunming, Yunnan Province, People's Republic of China |
| 推荐引用方式 GB/T 7714 | Hu, Ke,Chen, Kun,Xiang, Fu-Yuan,et al. LL Com: A Near-contact Total Eclipsing Binary at a Key Stage of Evolution[J]. ASTRONOMICAL JOURNAL,2019,158(3):9. |
| APA | Hu, Ke,Chen, Kun,Xiang, Fu-Yuan,Yu, Yun-Xia,&Zhao EG.(2019).LL Com: A Near-contact Total Eclipsing Binary at a Key Stage of Evolution.ASTRONOMICAL JOURNAL,158(3),9. |
| MLA | Hu, Ke,et al."LL Com: A Near-contact Total Eclipsing Binary at a Key Stage of Evolution".ASTRONOMICAL JOURNAL 158.3(2019):9. |
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| LL Com_ A Near-conta（1179KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 | |
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